https://wccftech.com/marvels-avengers-guide-to-all-known-comic-and-intel-locations/

Third-person action-adventure? A variety of different locations and levels to smash, blast, and swing your way through? Then you shouldn’t be at all surprised to discover that Marvel’s Avengers has plenty of collectibles to gather up.

The collectibles in Marvel’s Avengers come in two different flavours. Firstly, there’s a whole stack of comics for you to find throughout the campaign, featuring your favourite heroes, which provide a handy little stat boost as well. On top of that, there’s also the intelligence collectibles that add to the lore of the game and the world (and your achievement collection too).